A week before his debut, Smith was promoted to the first team alongside his U21 youth team compatriot Jordan Rossiter. On 26 December 2013, Smith was named on the Liverpool bench in a 2–1 loss to Manchester City.[5] Three days later, Smith made his senior debut for Liverpool after coming on in the 59th minute, replacing injured Joe Allen, in a match against Chelsea at Stamford Bridge. Despite his original position being left back, he was deployed in the left wing as further as possible but he was not able to make a difference to the result as Liverpool lost the match 2–1. For the occasion he was handed no 44 previously worn by current teammate Jordon Ibe.[6]

On 7 August 2014, Smith was loaned to Swindon Town on a season-long youth loan.[7] He made his debut for the club, playing the full match on 9 August.[8] On 20 October 2014, Smith was then recalled by Liverpool and returned to his parent club.[9]

Although he was born in Australia, Smith was also eligible to play for England as his parents are English.[10] Smith represented the England under-17 side at the 2011 FIFA U-17 World Cup and made his England U21 debut at the end of the 2013–14 season.[4] On 21 August 2014, Smith was named in the Socceroos squad to face Belgium and Saudi Arabia.[11] He completed his change of eligibility to Australia during a friendly against Belgium on September 6, 2014.[12]